During Carolyn's visit, she detected EFB in our hive #1 and used a test kit to prove her findings. We have a couple of these test kits for club use. Carolyn actually gave us an OSU Honey Bee Disease Diagnostic Kit from which we took an EFB test kit. I have ordered 3 more EFB test kits for $17 each, and 1 AFB Test Kit for $17.95.
Here are some pics of the findings.